Malicious PDF — malware analysis report

Static analysis result for SHA-256 9703430808cbb158…

MALICIOUS

PDF

81.2 KB Created: 2021-06-29 13:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8b3691e70761ffe267aed200f6f6e099 SHA-1: e7cd56472b26012e76a07037ff501524aaa8e36c SHA-256: 9703430808cbb158af138fa4ccfe0ca5eb121283f30a831bfa93ec5b7be8d9de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicating it functions as a link farm. These links likely lead to phishing pages or further malware downloads, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://drafthe.ru/uplcv?utm_term=butterfly+all+stages
    • https://ascinfratech.com/clientprojects/trading/file/zomubimezum.pdf
    • http://d4svancouver.com/clients/c/c8/c8601140a4283eb9b700f388a83987a3/File/60154450101.pdf
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/60bb920a89d8a310884efd9496bd32d6/videwimop.pdf
    • http://betheaskssd.com/flash/betheaskssd.com/file/suwulifobezopuminekolaw.pdf
    • http://kapsalonvogue.nl/files/file/mitorerewovonezozufo.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/1a31a4bef7a95782825936e329c090a7/zefawudexoselejuzexi.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b18c49fa1---7986397675.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/587qiao13781c56j73c97oj035/duwijumo.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/26d655e09c8efc6a893a617df3a54a1c/latawixi.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/f55a99c9235d710591cdf340fd43c60c/kigipurex.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a712b841b17---91106106127.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/df85004f76fc7430f9c581df65a23182/99652764376.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f27835b64---dafusakelumalafilu.pdf
    • http://saipanbooking.com/FileData/ckfinder/files/20210619_8ADE72FF0B7F4C67.pdf
    • http://qiuyutv.com/userfiles/files/20210614080123.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cc2d0dd64d3---72367381613.pdf
    • https://service-panev.com/userfiles/delitoku.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/3d4803b2ca6281e0cbe2860b7e280f1c/31581536548.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984cf5c6f79---nasoxusire.pdf
    • http://hrzservices.com/uploadfiles/file/86214469842.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec45c8326c---jojavavegepagora.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/9ddea4g4unvehpn3irihmhmq0c/vitigix.pdf
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/5079428446.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbb6.bin
e81b472e4cbfb23848c0b2757af43c63ca2b9196948630d7271b02b97fc0f058
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB6 10340 bytes
font_01_sfnt_off0000f34c.bin
6301b5bb69b70dc8eed2d8911c67e3c42225da7501b40f5d7625bfacf874db3b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF34C 16672 bytes
font_02_sfnt_off00011e38.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E38 16792 bytes